Dental impression-tray.



No. 883,055. PATENTED MAR. 24, 1908.

H. E. SMITH. DENTAL IMPRBSSION TRAY.

APPLIOATION FILED JUNE 22.1907.

INVENTOH HEIRABE 1?. SMITH.

A TTOHNEYS To all whom itmay concern:

HORACE SMITH, or SEATTLE, WASHINGTON.

DENTAL mrn ssIoN-Tmiy.

No. 883,055. Specification of Be it known that I, HORACE F. SMrrH, a

citizen of the United States, and a resident of Improvement in Impression-Trays, of which mally closed against the impression tray.

Seattle, in the county of King and State of Washington, have invented a new and useful the followingis a specification.

My invention is an improvement in impression trays for use by dentists in taking impressions; and the invention consists in certain novel constructions and combinations of parts as will be hereinafter described and claimed. p g

In the drawing Figure 1 is a erspective view of the tray with the guard or dilator lates closed a ainst the sides of the tray; ig. 2 is a top p an view of the tray with the guard plates spread laterally away from the sides of the tray, and Fig. 3 is a cross section on about line 3-3 of Fig. 2.

The tray A is provided at its front end with a plate A forming a handle and is made hollow so a current ,of air may be forced into one. tube A andesoape through the other tube A for cooling the impression which can be done usually in this way in thefraction. of a minute. The handle plate A is preferabl an extension of the bottom plate of the ho low tray.

In making the tray hollow a false bottom of tin or other sheet metal may be soldered at its edges to the edges of the tray'proper as will be understpod from the drawing.

The ard or dilator lates B. prevent the cheeks om folding wait: taking the impression. These plates conform to the edge contour of the tray at theopposite sides thereof and fit close to and against the tray when closed as shown in Fig. 1' and may be spread laterally to the position shown in Fig; 2' to prevent the cheeks from folding while the lmpression is be' taken. As shown the guard plates are pivoted at B are spring actuated at C to the closedosition shown in Fig. 1 and are provided with the handles B extended over the handleplate A of the trayin convenient position to be pressed towardeach other to spread the guard plates to the position shown in Fig. 2'. In pivoting the guard plates' at B they are preferably provided with shanks B which incline inwardly over the handle plate to the pivotal pin B and thence diverge and have the upturned portions B forming holds, a pin B on Letters Patent. Application filed June 22,1907. serial No. 380,313.-

-with upturned plates and a sprin Patented March 24, 1908.

'tions forming a stop to limit the motion of the handles, as shown in the drawings.

The s ring C it will be noticed is coiled around t 1e pivot pin B and presses at its ends against the parts 13 on the handle portions thus operating, to hold the dilator plates nor- 1. An impress ion tray made hollow and having connections for the circulation through it of a cooling fluid and rovided with a forwardly projecting handle p ate, and the spring actuated guard or dilator plates separate from and conformed llOfiIldlBXi/Qlld" ing alon side the tray and ivoted to the handle p ate and having han eportions extending thereo'verwhereby they may be operated to spread thedilator plates independ I ent of the tray, substantially as and for the purposes set fOIthf' 2. An impression tray providedwith the pivoted guard or dilator plates independent of the tray and extending along its opposite sides and movable. radially therefrom and normally spring actuatedto closed position and adapted to he s read to prevent the cheeks from folding w ile taking the impression, substantially as set forth.

' 3. An impression tray provided with a projecting handle :plate In combination with guard .or dilator plates extending alongside the trayand provided at their front ends with inwardl projecting handle portions a pivot upon tliehandle plate for said handle portions and having diverging. portions ex tending over" the handle plate and provided coiled around-the pivotof the handle portions and hearing at, its end against the upturned parts of said handle portions, substantially as described." r

- HORACE F. SMITH.

Witnesses:

PIERRE Banuns,

i hlmdlephte and between the handl'e porvi I 'PETER Hmmlcn; 

